<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			var stu2 = {
							id:2,
							name:"王五",
							age:19
						}
						
						// 1. for ... in .
						
						for(var i in stu2)
						{
							document.write(i+","+stu2[i]+"<br />")
						}
						
						// 2. with 语句 (在with语句块中 可以省略不写 stu2)
						with(stu2)
						{
							document.write(id+","+name+","+age);
						}
						
						
						
						
					</script>
	</body>
</html>